What is metadata and what do I need to know about it? These are two key questions for the information professional operating in the digital age as more and more information resources are available in electronic format. This is a thought-provoking introduction to metadata written by one of its leading advocates. It assesses the current theory and practice of metadata and examines key developments--including global initiatives and multilingual issues--in terms of both policy and technology. Subjects discussed include: definitions and concepts; retrieval environments like Web, library catalog, documents and records; management; e-learning; interoperability; information security; authority control; authentication and legal admissibility of evidence; records management and document lifecycle; preservation issues; document and records management; content management systems for the Internet, and more. Publishers, policy makers, and practitioners in other curatorial traditions such as museums work or archiving will also find much of relevance.